<!DOCTYPE html>
<html  xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<p>this is main.html</p>
<a href = "/toUser">user</a>
<a href = "admin.html">admin</a>
</body>
</html>